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Sudoku Player

Wrote completely in about 6 hours (yes, straight).
To move the selected square, use the dpad.
To edit the current number open the edit tab and click the number you wish to save, click the same number twice to clear that square.
To add notes, click the pencil button while in the edit tab, and add notes as you wish.
to save your board (including notes), press save. To check if your solution matches the given solution, press check. You can also increment or decrement the current number selected if you do not want to go into the edit tab.